Here’s a statement of the results of an experiment. “As the sample got older, from 50 to 70 years, lung volume decreased.” Although this statement might be true, what might be one interpretation,...

Here’s a statement of the results of an experiment. “As the sample got older, from 50 to 70 years, lung volume decreased.” Although this statement might be true, what might be one interpretation, given what you know of the use of age as an independent variable?